Answer:
stress
Explanation:
Common causes of chronic insomnia include: Stress. Concerns about work, school, health, finances or family can keep your mind active at night, making it difficult to sleep. Stressful life events or trauma — such as the death or illness of a loved one, divorce, or a job loss — also may lead to insomnia.
Answer:
C. Chronic Stress
Explanation:
I took the test
The creation of electricity in a coil of a wire through the movement of a magnet is called what?
A) electromagnet
B) Magnetosphere
C) Magnetism
D) Electromagnetic Induction
Answer:
D. Electromagnetic Induction.
Explanation:
A force of 90N is applied to each cart below, which one will accelerate the fastest?
Mass: 5 kg
Mass: 6 kg
mass: 8 kg
Mass: 9 kg
Answer:
5kg
Explanation:
The cart with the least amount of mass will result in the fastest acceleration.
The cart with the fastest acceleration is 5 kg cart because its mass is the smallest.
The given parameters;
applied force, F = 90 Nmass of cart: 5kg, 6kg, 8 kg, 9 kgAccording to Newton's second law of motion, the force applied to an object is directly proportional to the product of mass and acceleration of the object.
F = ma
The acceleration of the 5 kg cart is calculated as follows;
[tex]a = \frac{F}{m} \\\\a = \frac{90}{5} = 18 \ m/s^2[/tex]
The acceleration of the 6 kg cart is calculated as follows;
[tex]a = \frac{F}{m} \\\\a = \frac{90}{6} = 15 \ m/s^2[/tex]
The acceleration of the 8 kg cart is calculated as follows;
[tex]a = \frac{F}{m} \\\\a = \frac{90}{8} = 11.25 \ m/s^2[/tex]
The acceleration of the 9 kg cart is calculated as follows;
[tex]a = \frac{F}{m} \\\\a = \frac{90}{9} = 10 \ m/s^2[/tex]
Thus, the cart with the fastest acceleration is 5 kg cart because its mass is the smallest.
Learn more here:https://brainly.com/question/11657305
Which pair of waves could overlap to produce a wave with a higher amplitude
through interference?
A. Two waves of the same amplitude with crests that overlap troughs
B. Two waves of the same amplitude with crests that are perfectly
aligned
C. Two waves of different amplitudes that are also different types of
waves
D. Two waves of different amplitudes with crests that overlap
troughs
Answer: The Answer is B (Sorry if this is late)
Explanation:
I couldn’t find the answer to the question myself then found you, with no answer. So I guessed and failed my third question of the quiz, you were worth the sacrifice though ✨
The pair of waves could overlap to produce a wave with a higher amplitude through interference is that two waves of the same amplitude with crests that are perfectly aligned. Hence, option B is correct.
What is Amplitude?The maximum deflection or distance made by a point on even a vibrating object or wave relative to its equilibrium location is known as the amplitude in physics. It is equivalent to the length of a vibration path divided in half.
A pendulum's amplitude is therefore equal to the distance that the bob travels when swinging through one side to another. Vibrating sources produce waves, whose amplitude is inversely proportional to the source's amplitude.
The largest deviation of any place on the string out of its place when the line is at rest is used to determine the amplitude of a wave propagation, like the wave on such a plucked string.
Therefore, it concludes that option B is correct.
To know more about Amplitude:
https://brainly.com/question/8662436
#SPJ2
To open a soda can lid, a force of 50 N is applied to a car key, which acts as a lever. If the car key applies a force of 400 N to the lid, then the mechanical advantage of the car key is ___.
a 12
b 10
c 6
d 8
Explanation:
Given. Required
wo = 400N. MA=?
wi = 50N
Solution
MA = wo = 400N =8
wi. 50N
100 point question!! A driver begins to brake when her car is traveling at 15.0 m/s, and the car comes to a stop 4.0 s later. How much farther does the car go after the driver begins to brake, assuming constant acceleration?
Answer:
30 m
Explanation:
Let's list out the known variables that we are given in this question.
v₀ = 15 m/sv = 0 m/s t = 4 sWe are trying to solve for displacement in the x-direction.
Δx = ?Find which constant acceleration equation contains all 4 of these variables.
[tex]\displaystyle \triangle x = \Big (\frac{v+v_0}{2} \Big ) t[/tex]Plug the known values into the equation and solve for delta x.
[tex]\displaystyle \triangle x = \Big (\frac{0+15}{2} \Big ) \cdot 4[/tex] [tex]\displaystyle \triangle x = \Big (\frac{15}{2} \Big ) \cdot 4[/tex] [tex]\displaystyle \triangle x =\frac{60}{2}[/tex] [tex]\triangle x = 30[/tex]The car goes 30 m after the driver begins to brake.
Answer:
the answer should be 30 m
Explanation:
have a good day
A Stone thrown from the top of a building is given an initial velocity Of 20.0 metre per second straight upward determine the time in second at which the stone reaches its maximum height. ( Take sec2 g=9.8m/s)
A) 2.8
B) 2.04
C) 1.67
D) 2.7
We know that,
[tex]{\boxed{\sf{v=u+gt}}}[/tex]
[ Put values ]
[tex]\begin{gathered} \implies \sf \: {0} \: = {20} + ( - 9.8) \times t \\ \\ \implies \sf \: 0 = 20 - 9.8t \\ \\ \implies \sf \: 9.8t = 20 \\ \\ \implies \sf \: t = \dfrac{20}{9.8} \\ \\ \implies \sf \: t = 2.04\end{gathered}[/tex]
Therefore, the time at which the stone reaches its maximum height will be 2.04 s.
Which item rotates in a magnetic field as an electric motor produces kinetic energy.
A. Lightbulb
B. Loop of wire
C. Battery
D. Permanent magnet
Answer:
Loop of Wire
Explanation:
what do you think president biden should say in his inaugural speech to unify the country’s
Answer:
If you haven't heard, Joe Biden would like to unite America.
It was a focus of the Democrat's campaign. It's even the theme of Biden's inauguration — "America United."
The inaugural committee says the slogan "reflects the beginning of a new national journey that restores the soul of America, brings the country together, and creates a path to a brighter future."
If only it were that easy.
When Biden is sworn in at 12:01 p.m. ET Wednesday as the 46th president of the United States, it will be with the understanding that the country is as divided as it's ever been, as pessimistic as it's been in three decades and facing health, economic and racial crises.
It will also be a very different inauguration than has ever been seen in U.S. history. Four years ago, President Trump was arguing over his crowd size compared with Barack Obama's record-setting turnout of supporters on the National Mall.
Explanation:
btw i would rather have him as president
Which is a correct description of Hooke's law?
-The force applied to a spring equals the product of the spring constant and the displacement.
-The force applied to a spring equals the spring constant divided by the displacement.
-The spring constant of a spring equals the product of the force applied and the displacement.
-the spring constant of a spring equals the displacement divided by the force applied.
Answer:
The force applied to a spring equals the product of the spring constant and the displacement.
Explanation:
From Hooke's law, the force required to extend or compress a spring by a distance is proportional to the distance. This means extension is proportional to force.
Mathematically it is stated as;
F= -k*x where k is the spring constant and x is the displacement of the spring after adjustment.
Hooke's law is an example of elasticity property of a material which is the ability of the object to return to a normal shape after experiencing a distortion also called "restoring force"
Answer:
Option A
Explanation:
According to the cell theory, which statement is correct? A) Viruses are true cells. B) Cells are basically unlike in structure. C) Mitochondria are found only in plant cells. D) Cells come from preexisting cells.
Answer:
D) Cells come from preexisting cells.
Explanation:
The universal i.e widely accepted cell theory was proposed in 1800's by the contribution of three scientists namely Theodor Schwann, Matthias Schleiden, and Rudolf Virchow. They came together and proposed three main components that make up the cell theory today. The components are:
- All living things are composed of one or more cells.
- Cell is the basic and fundamental unit of life
- All cells come from preexisting cells.
Based on these three components of the cell theory, the statement that: "Cells come from preexisting cells" in the options is correct.
A force of 100.0N accelerates a 5.0 kg box at 15.0 m/s^2 along a level surface. Find the coefficient of sliding friction for the box. After that, how far will the box have gone after 5.0 seconds of pulling it?
By balancing the force, we get :
100 - Frictional Force = ma
100 - μmg = ma
100 - μ(5)(10) = (5)(15)
50μ = 25
μ = 0.5
Distance travelled by box in 5 seconds is :
[tex]d = ut + \dfrac{at^2}{2}\\\\d = 0 + \dfrac{15\times 5^2}{2}\\\\d = 187.5\ m[/tex]
Hence, this is the required solution.
can some one explain me big bang theory ?
Answer:
The Big Bang Theory is the leading explanation about how the universe began. At its simplest, it says the universe as we know it started with a small singularity, then inflated over the next 13.8 billion years to the cosmos that we know today.
The propeller of an aircraft is spinning at 10 rev/s when the pilot shuts off the engine. The propeller reduces its angular velocity at a constant 2.0rad/s2 for a time period of 40 s. What is the rotation rate of the propeller in 40 s
One revolution of the propeller corresponds to a rotation of 2π radians, so that the propeller has an initial angular velocity of
10 rev/s = (10 rev/s) • (2π rad/rev) = 20π rad/s
The propeller thus has an angular velocity ω at time t of
ω = 20π rad/s - (2.0 rad/s²) t
so that at t = 40 s, its angular speed is reduced to
20π rad/s - (2.0 rad/s²) (40 s) = (20π - 80) rad/s
Convert this to a rotation rate by dividing this result by 2π :
(20π - 80) rad/s = ((20π - 80) rad/s) • (1/(2π) rev/rad) ≈ -2.73 rev/s
which would suggest that the propeller has started to turn in the opposite direction at a rate of 2.73 rev/s.
A 60 kg swimmer suddenly dives from a 150 kg raft with a speed of 1.5 m/s. The raft is initially at
rest. What is the speed of the raft immediately after the diver jumps if the water has negligible
effect on the raft?
Answer:
v2 = 0.6 m/s in opposite direction
Explanation:
The computation of the speed of the raft is as follows
The center of system mass would be remains at the same place also it has no external force applied
Therefore
V = 0
So,
M1.V1= - (M2.V2)
where,
M1 = 60 kg, V1 = 1.5 m/s
M2 = 150 kg
Now
60 × 1.5 = - 150 × v2
v2 = -0.6 m/s
v2 = 0.6 m/s in opposite direction
A golf ball of mass m is hit by a golf club so that the ball leaves the tee with speed v. The club is in contact with the ball for time T. The average force of the club on the ball during the time T is:
Answer:
Explanation:
Given
Mass = m
Time = t
Force = mass × acceleration ..... 1
Where acceleration = velocity/time
Ave Force = m×∆v/∆t
= mv/t
A pipe that is open at both ends has a fundamental frequency of 320 Hz when the speed of sound in air is 334 m/s. What is the length of this pipe
Answer:
Length of pipe 0.5m
Explanation:
Step one
Given data
fundamental frequency of 320 Hz
n=1
Velocity v=334m/s
Note: the subsequent frequency of sound are a multiple of it fundamental frequency
Step two
Applying the formula we have
Fn=nv/2l
Substitute
320=1*334/2L
Cross multiply
320*2L=334
640L=334
Divide both sides by 640
L=334/640
L=0.5m
What effect does noise have on different types of signals?
A. It distorts digital signals, making them unreliable.
B. It distorts analog signals, making them unreliable.
C. Noise has no effect on either analog or digital signals.
D. Noise prevents the transmission of both analog and digital
signals.
Answer: it is actually B. :)
Explanation:
Noise can distort analog signals making them unreliable.
What is noise?The random or unwanted signal that mixes up with the original signal is called noise. Noise is an unwanted signal that interferes with the original message signal and causes the message signal's parameters to be corrupted. The message is transformed as a result of this change in the communication process. It's most likely to be inputted at the receiver or channel.Noise can actually bury, distort or cause interference to the analog signal carrying the intelligent information.
What is analog signal?A signal in which a characteristic grows and decreases in lockstep with the object being sent is known as analog signal. The power of the radio wave, for example, rises and falls in accordance with the loudness of the original sound in AM radio.Hence, the correct answer is B.
To know more about Noise here
https://brainly.com/question/21988943
#SPJ2
Will give brainliest!! Pls answer! HELP ME!!!!!!
Answer:
See the explanation.
Explanation:
Q9. Irregular reflection happens when a set of parallel beams are reflected from non-smooth surface which results in non-parallel reflected beams.
Q10.
i) Periscope
ii) There are different types of periscopes but the main characteristic of this instrument is observation over the obstacles or in general objects that are not in the line-of-sight. Basic Periscope uses parallel angled mirrors to project objects that are above the surface in submarines.
a chuck wagon with an initial velocity of 4 m/s and a mass of 35 kg gets a push with 350 joules of force. what is the wagon's final velocity?
Answer:
the final velocity of the wagon is 6 m/s.
Explanation:
Given;
initial velocity of the wagon, u = 4 m/s
mass of the wagon, m = 35 kg
energy applied to the wagon, E = 350 J
The final velocity of the wagon is calculated as;
E = ¹/₂m(v² - u²)
[tex]m(v^2-u^2) = 2E\\\\v^2-u^2 = \frac{2E}{m} \\\\v^2 = \frac{2E}{m} + u^2\\\\v = \sqrt{\frac{2E}{m} + u^2} \\\\v = \sqrt{\frac{2(350)}{35} + (4)^2}\\\\v = 6 \ m/s[/tex]
Therefore, the final velocity of the wagon is 6 m/s.
Given:
Wagon's initial velocity,
u = 4 m/sMass,
m = 35 kgApplied energy,
E = 350 JWe know,
→ [tex]E = \frac{1}{2} m(v^2-u^2)[/tex]
→ [tex]m(v^2-u^2) = 2E[/tex]
or,
→ [tex]v^2-u^2 = \frac{2E}{m}[/tex]
→ [tex]v= \sqrt{\frac{2E}{m} +u^2}[/tex]
By substituting the values,
[tex]= \sqrt{\frac{2(350)}{35}+(4)^2 }[/tex]
[tex]= 6 m/s[/tex]
Thus the answer above is correct.
Learn more about mass here:
https://brainly.com/question/22256985
A 75-kg man is riding in a 30-kg cart at 2.0 m/s. He jumps off in such a way as to land on the ground with no horizontal velocity. The resulting change in speed of the cart is:
Answer:
Explanation:
We shall apply law of conservation of momentum .
M and m be mass of man and boat . V and v be velocity of man and boat .
MV = mv
75 V = 30 v
2 .0 m/s is relative velocity of man wrt boat .
Given v + V = 2
V = 2 - v
75 ( 2 - v ) = 30 v
150 - 75 v = 30 v
150 = 105 v
v = 1.43 m /s
A 1.0 kg mass at the end of a spring has an amplitude of 0.10 m and vibrates 2.0 times per second. What is its velocity when it is 0.10 m from equilibrium.
Answer:
[tex]v=0m/s[/tex]
Explanation:
From the question we are told that
Mass of object[tex]M=10kg[/tex]
Amplitude[tex]A=0.10m[/tex]
SHM [tex]w=2.0 times per second.[/tex]
Distance from equilibrium [tex]0.10m[/tex]
Generally the equation for SHM displacement from equilibrium position is mathematically given by
[tex]v=Aw\sqrt{1-\frac{x^2}{A^2}}[/tex]
For [tex]x=0.10[/tex]
Therefore
[tex]v=Aw\sqrt{1-\frac{0.10^2}{A^2}}[/tex]
[tex]v=0.10*2\sqrt{1-\frac{0.10^2}{0.10^2}}[/tex]
[tex]v=0.10*2\sqrt{1-1}[/tex]
[tex]v=0m/s[/tex]
An object with mass 'm' is moving in a circle of radius 'R' at a constant speed of 'v.' The acceleration of the object will INCREASE if _____. List all that apply ... .
Answer:
Explanation:
The acceleration of an object is given by the formula
a = v²/r
The acceleration of the object is bound to increase, if and only if the following are changed as well.
The mass of the object is increased,
The speed of the object is increased,
The radius of the object is contrarily decreased
Taking another look at the formula, we see that if we increase the speed of the object, it increases the acceleration. And since the radius is in the denominator, it has to be reduced for the acceleration to increase
With what speed would mail pass through the center of the Moon if falling in a tunnel that runs through the center
Answer:
$v_f = = 7.9 \times10^3 \text{ m/s }$
A wrench is accidentally dropped from the top of a mast on a sailboat. Will the wrench hit at the same place on the deck whether the sailboat is at rest of moving with a constant velocity
Answer:
Yes, because the wrench is moving at the same speed as the sailboat.
The main difference is that a person on the ground would see the wrench moving diagonally, while a person on the boat would see the wrench falling straight down,
This difference in paths lead to the relativistic change in lengths.
What happens to distance when velocity is doubled
in which medium does the speed of air is the greatest? explain why?
The speed of air greatest in a medium with high pressure. Air is moving from high pressure to low pressure areas called the winds.
What are winds?The natural movement of air or other gases in relation to a planet's surface is referred to as wind. There are many different sizes of winds, ranging from thunderstorm flows that last only a few minutes to local breezes.
Large-scale atmospheric circulation is primarily brought on by the planet's rotation and the difference in temperature between the equator and the poles (Coriolis effect).
The air can move through a medium as well through vacuum. Air blows with the highest speed when the medium have higher temperature and pressure.
Find more on winds:
brainly.com/question/616790
#SPJ6
Which of the following is evidence that a physical change has
occurred? *
a. Broken glass
b. Rust
c. Bubbles
d. Formation of a solid precipitate
Answer:
Broken glass
Explanation:
Jennifer and katie stand and lean on each other. Jennifer weighs 150 pounds and katie weighs 120 pounds.
Answer:
Jennifer
Explanation:
she has more mass which means she is using more force
The only planet in the solar system with the temperature that can support life is
Answer:
earth
Explanation:
its the only planet.
Using the rules for significant figures, what do you get when you multiply 67.6 by 1.2?
Answer:
81
Explanation:
The problem here is to use the rules for significant figures in the multiplication below.
67.6 x 1.2:
This product will yield an answer that will produce the least number of significant figures.
67.6 has 3 significant figures; 6, 7 and 6
1.2 has 2 significant figures; 1 and 2
The product must give us an answer of two significant figures:
67.6 x 1.2 = 81.12 to 2significant figures gives 81
The solution to this problem is 81